oh i see, well i guess you could do some sort of coil and such but that would take a sh*t load of time and it still wouldn't be dynamic, I'm sorry but as far as my skills with inventor goes, your'e pretty much screwed :/

Hello, Here is a part Rope / Cuerda I made for your question I hope it helps . If you would like to check it out and if you have any questions let me know. I made it in Autodesk inventor 2015.
I used arcs and then I switch to an spline, if you have an idea where is going to run this rope you could ad the positions and create constrains for either the spline or the arcs. Also you can twisted as you need. I hope this helps.

As far as i know there is no tool for this specific task, if your rope is intended to always be S shaped then just start a new sketch, select your favourite spline tool and draw the shape of your rope, then select the offset tool and make an offset equal to the the radius of your rope, draw 1 line at each end of it to connect them, then just revolve the sketch and put some nice texture on it.

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